Textile cot



June 10, 1958 J. ROCKOFF 2,837,775"

TEXTILE COT Filed July 19, 1952 INVENTOR. JOSEPH ROGKOFF ATT'Y.

in the change in drafting properties.

2,837,775. TEXTILE cor Joseph Rockolf, Dayton, Ohio, assignor to The Dayton Rubber Company, a corporation of Ohio The present invention relates to textile machine units, and more particularly, to cots or roll covers for spinning rolls or other rolls used in the drafting or ,spinningof textile fibers. 7

A textile Yroller as used in present day cottonand spinning machines comprises a metalcore or arbor having a sleeve-like roll cover known as a cot, surrounding theilcore. In the past these covers have been made of leather, cork compositions, or certain types of rubber compounds especially adapted for this purpose.

At one time most textile cots were made of leather, but this material. proved to be unsatisfactory for use on cotton machines which work at relatively high speeds, due to stretch, lack of uniformity, short life, and relatively poor drafting properties particularly in connection with lapping up and eyebrowing. In recent years cots have-been made of synthetic materials which show considerably longer life than leather and have greater resistance to lapping up and eyebrowing and have, in general, proved to be a satisfactory substitute for leather.

Despite the improved characteristics which have been imparted to textile cots by the use of certain types of synthetic rubber, these cots do not function perfectly under all conditions and for all types of fibers. Some of the newer types of cots, although considerably improved over leather, still exhibit a tendency toward eyebrowing. This condition results from the failure of the cot to carry short fibers or clearer waste to. the top clearer in order to gather properly. Instead, these .short fibers collect at the outside edge of the top clearer and hang down over the roll. This condition is called eyebrowing, and the mass of fibers which hang down is called an eyebrow. As the size of the eyebrow increases, it will touch the yarn and bunches of short fibers will become intermingled with the yarn thus impairing its quality.

It has been found that cork may be used as a roll covering or in admixture with rubber with a certain degree of success as a textile drafting material. However, the use of cork has been found to have certain disadvantages, among which are a certain degree of hygroscopicity, poor resistance to indenting or marking-as a result of the contact with the fibers, and a tendency to become slick and change its drafting properties after a period of use. Such cots are also-found to be affected by light resulting As a result, frequent grinding is necessary in order to renew the surface.

In accordance with the present invention, applicant has now discovered that improved drafting properties are obtained by the incorporation of minor proportions of ground particles of the soft fibrous shells of certain types of nuts. These shells must be of a soft, porous and fibrous structure, the most common examples of which are the hullsv of peanuts and the shells of almonds. These shells are ground to a desired particle size and incorporated into a suitable rubber compound by milling or The appended drawings illustrate a typical cot construction of the present invention.

In the drawings:

Figure 1 shows a view in elevation partly in cross section of a conventional type of double cot mounted on an arbor.

Figure 2 illustrates in cross section an enlarged view of a portion of the cross section of the cover shown in Figure 1. I I

In the drawings "the double arbor is represented by 10, each side of the arbor having a roll cover 11 and 11a mounted thereon. The particles 13 which are embedded in the composition, are exposed at the surface of the roll and are also shown embedded in the roll compound 11 in Figure 2. 7

- In the fabrication of-the cot referred to, the nut hulls are ground to a predetermined size and incorporated in the unvulcanized rubber compound in the desired proportions along with vulcanizing and other compounding ingredients. The mixture is then extruded in a tubular form, placed on a core, rag wrapped, and vulcanized.

After vulcanization, the rag wrap is removed and the resulting product ground down to the desired size. After this, the tube is cut to the desired lengths and the cots mounted on the arbor. A finish grind may be used before the cot is placed in operation. The preferred type of synthetic rubber with which this material is incorporated is an oil-resistant copolymer of the butadiene-acrylic nitrile type; also known as Buna-N, perbunan, GR-A, or by other well-known terms used in the trade. While the particle size and range of proportions of the nut shell material may vary considerably over a wide range, it has been found that certain particle sizes and proportions are of greater importance in obtaining optimum results. The particle size is generally preferred to be in the range of about 20 to 60 mesh, and the range of proportions is generally preferred to be a range of about 20 to 125 parts per parts of rubber by weight based on the rubber in the compound;

The following example will illustrate a typical cot compound of the type described above:

Parts of weight Perbunan (74% butadiene 26% acrylo-nitrile emulsion copolymer) 100 Plasticizer and tackifier phenol-formaldehyde ressin (Bakelite)- 10-20 Sulfur 5 Accelerator (mercaptobenzothiazole or the like) 1-2 Zinc oxide -z 8-12 Clay filler 15- 35 Diphenylguanidine 0.25 Ground peanut shells particle size 40 mesh 50 shells.

I claim:

'1. A textile fiber drafting cot having a working surface composed of vulcanized oil-resistant synthetic rubber having intimately incorporated therewith a minor pro 7 c Patented June '10, 1958:

W 3. A textile fiber drafting cot portion of particles of soft, porous, fibrous nutshells, said particles being exposed at said cot surface.

2. A textile fiber drafting cot having a working surt ace composed of vulcanized oil-resistant synthetic rubher having intimately incorporated. therewith a minor.

proportion of particles of ground, up peanut .shells, saidparticles being exposed at said cot surface.

having. a working surface composed of vulcanized oil-resistant synthetic rubber having intimately incorporated therewith a minor proportion of particles of ground up almond shells, said particles being exposed at 'said cot surface.

4. A textile fiber drafting cot having a working surface composed of vulcanized oil-resistant synthetic' rubher having intimately incorporated therewith a minor proportion of particles of soft, porous, fibrousnutshells, wherein the particles range in size'from about 'rnesh to about 60 mesh andare incorporated in the proportion of about 20 to 125 thetic rubber by saidcot surface.

parts of the shell per 100 parts of synweight, saidparticles being exposed at 5. A textile fiber drafting cot having a working surface composed of a vulcanized oil-resistant. butadiene-.

proportion of particles of peanut shells, said particles being exposed at the surface. of the cot.

7. A textile cot according to claim 6 wherein the peanut shells have a particle size of about 20 to 60 mesh and are incorporated in the proportion of about 20 to 125 parts per 100 parts of vulcanized butadiene-acrylic nitrile copolymer by weight.

8. A textile cot according to claim 6 wherein the peanut shells have a particle size of about mesh and are incorporated in the proportion of about parts per parts of vulcanized butadiene-acrylic nitrile copolymer by weight.

9. A textile fiber drafting cot having a working surface composed of a vulcanized butadiene-acrylic nitrile copolymer having intimately incorporated therein a minor proportion of particles of almond shells, said particles being exposed at the surface of the cot.

References Cited in the tile of this patent UNITED STATES PATENTS 2,373,698 'McGeary Apr. 17, 1945 2,414,803 DAlelio Jan. 28, 1947 2,450,410 Baymiller Oct. 5, 1948 2,467,214 Luaccs Apr. 12, 1949 2,570,935 Freedlander Oct. 9, 1951 2,585,219 Boyle Feb. 12, 1952 2,645,587 Williamson July 14, FOREIGN PATENTS 15,988 Great Britain of 1915- 

1. A TEXTILE FIBER DRAFTING COT HAVING A WORKING SURFACE COMPOSED OF VULCANIZED OIL-RESISTANT SYNTHETIC RUBBER HAVING INTIMATELY INCORPORATED THEREWITH A MINOR PROPORTION OF PARTICLES OF SOFT, POROUS, FIBROUS NUTSHELLS, SAID PARTICLES BEING EXPOSED AT SAID COT SURFACE. 